What is the effect of air-entraining agents on the freeze-thaw resistance of concrete?

what is the impact of air-entraining agents on the freeze-thaw resistance of concrete? among concrete materials, air-entraining agents have the greatest and most significant impact on frost resistance. many engineering practices have proven that the freeze-thaw resistance of concrete mixed with air-entraining agents has been greatly improved. the reason why air-entraining agents can improve the…